With that many rigs and so much equipment, have you ever considered setting up a warehouse out of state or even out of country? Here in Canada, we get between 8-15 cents/kw depending on province (in CAD). It might be worth it to spend the flight up, find a few partners, and work things out.
Also same question as above; how did you manage to get so many 1080 Ti's in bulk? I'm trying to build something of my own.
Edit: Correct me if my math is wrong, but you're looking at almost $15,000 monthly with that size of farm! For same power consumption would be ~$6,000 in Canada. Definitely worth the research if you are serious about this project.